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/**
* Marlin 3D Printer Firmware
* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
/**
* Implementation of EEPROM settings in SD Card
*/
#include "../../inc/MarlinConfig.h"
#if ENABLED(SDCARD_EEPROM_EMULATION)
#include "../shared/eeprom_api.h"
#include "../../sd/cardreader.h"
#define EEPROM_FILENAME "eeprom.dat"
#ifndef MARLIN_EEPROM_SIZE
#define MARLIN_EEPROM_SIZE 0x1000 // 4KB
#endif
size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
#define _ALIGN(x) __attribute__ ((aligned(x)))
static char _ALIGN(4) HAL_eeprom_data[MARLIN_EEPROM_SIZE];
bool PersistentStore::access_start() {
if (!card.isMounted()) return false;
SdFile file, root = card.getroot();
if (!file.open(&root, EEPROM_FILENAME, O_RDONLY))
return true;
int bytes_read = file.read(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
if (bytes_read < 0) return false;
for (; bytes_read < MARLIN_EEPROM_SIZE; bytes_read++)
HAL_eeprom_data[bytes_read] = 0xFF;
file.close();
return true;
}
bool PersistentStore::access_finish() {
if (!card.isMounted()) return false;
SdFile file, root = card.getroot();
int bytes_written = 0;
if (file.open(&root, EEPROM_FILENAME, O_CREAT | O_WRITE | O_TRUNC)) {
bytes_written = file.write(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
file.close();
}
return (bytes_written == MARLIN_EEPROM_SIZE);
}
bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
for (size_t i = 0; i < size; i++)
HAL_eeprom_data[pos + i] = value[i];
crc16(crc, value, size);
pos += size;
return false;
}
bool PersistentStore::read_data(int &pos, uint8_t *value, const size_t size, uint16_t *crc, const bool writing/*=true*/) {
for (size_t i = 0; i < size; i++) {
uint8_t c = HAL_eeprom_data[pos + i];
if (writing) value[i] = c;
crc16(crc, &c, 1);
}
pos += size;
return false;
}
#endif // SDCARD_EEPROM_EMULATION
#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
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